Wicked is the national touring production of the Broadway musical that explores the backstory of the witches of Oz, featuring music and lyrics by Stephen Schwartz and a book by Winnie Holzman based on Gregory Maguire’s novel. The show brings the Broadway production’s large-scale sets, elaborate costumes, and well-known songs like “Defying Gravity” to regional audiences. This touring engagement plays at the Boston Opera House, presenting the spectacle and pop-cultural popularity that have made Wicked a long-running theatrical hit.